Trimming mechanism for sewing-machines.



PATENTED SEPT. 5, 1905.

W. H. STEDMAN. TRIMMING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED 00T.7,1903.

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UNITED STATES PATENT OFFICE.

\"VlLLIAhl ll. S'lEDMAN, CF HAR"FORD, CONNECTICUT, ASSICUOR TO THE MERRClV MACHINE COMPANY, OF IlAH'll ORl), (.CNNECITICUT, A COR- PORATION OF CONNECTICUT.

Specification of Letters Patent.

Patented Sept. 5, 1905.

Application filed October 7, 1903. Serial ITO-176,145.

To mi] lw/mnt i/ nut colt/rent:

Be it known that I, lVILLIAM l-I. S'runnAN, a citizen of the United States, residing in the city of l'lartford, county of Hartford, and State of Connecticut, have invented certain new and useful Improvements in Trimming hereby declare the following to bea full. clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of this specification, and to the figures of reference marked thereon.

The improvements are particularly, though not exclusively, designed for use in trinnning mechanism of the general character shown and described in the Patent No. 733.760, issued to meJuly 1a, 1903, such trimming mechanism embodying a vibrating and a relatively fixed cutter for trimming the fabric.

The invention relates to the supporting. adjusting, and securing of the knives or cutters; and its object is to improve the general construction and operation of these portions of the trimming mechanism.

In the drawings, Figure 1 is a front elevation of a trimming mechanism embodying the present improvements with adjacent parts of an overseaming-machine in dotted lines. Fig. 2 illustrates the same parts in end elevation. Fig. 3 is an elevation of the stationary cutter, its holder or carriage, and the support for the latter, looking at the side opposite that seen in Fig. *2. Fig. 4 is a view, principally in vertical section, taken on the line T i, Fig. 1. Fig. 5 is a view, principally in horizontal section, taken on the line 5, Fig. 1. Fig. 6 is a vertical sectional view showing the means whereby the stationary cutter is secured to its holder. Fig. 7 is an end elevation of the holder or carriage for the lower or stationary cutter.

Like numerals of reference in the several figures indicate the same parts.

The number denotes the vibratingcutter, and the cooperating relatively fixed cutter. .In connection with the cutter 22 a lever or carrier 24: is provided, usually pivoted at its rear end on the pin 26 and supported near its opposite or forward end by a block 27, encircling an eccentric l4, slidably located in the carrier, so that the rotation of the eccentric imparts vibratory motion to the carrier 2& and the cutter 22. The carrier E4 has a lat orally-extending arm 24?, on which a carriage 29 is mounted and held by a dovetail connection. the said cutter being adjustably secured to the carriage, as heretofore. The carriage 1 29 is itself retained against accidental lateral displacement on the arm by a clamping-plate Mechanism for Sewing-Machines; and Ido and adapted to bind upon the carrier-arm.

27, secured to the said carriage by a screw 28 Describing now the improvements as embodied in the devices shown in the drawings, the number denotes a standard supporting the fixed cutter 23, the latter being secured to a holder or carriage 34, adjustably mounted on the standard. The adjustment of the holder or carriage is effected by a screw in the standard and having a flange 35 entering a notch in the said holder or carriage. To secure the holder 3 in an adjusted position, the rear side of the standard 33 is cut out to receive a clamp 36, Fig. a, whose opposite ends respectively engage the standard and bolder. .-\pproximately midway its length the clamp has threaded connection with a screw or bolt 33. 'journaled in the standard and operating to draw the clamp into or release it from biinling contact with the said standard and holder.

The holder 34 is grooved on one of its faces, as at 3*", Fig. 3, to receive the cutter 23 and has also a passage 39 intersecting the groove. This passage 39 at its end adjacent the groove 3% opens out into a recess 39 channeled across the face of said holder, and at its opposite end it is countcrbored, as at 39". A cutter-clamp 4:0 of bolt form is mounted in the passage 39 and provided with a head 40, held in the recess or channel 39, so as to be non-rotatable, while the opposite end of the clamp or bolt is threaded and provided with a covered nut 4f seating in the counterbore 39". The bolt-head T0 of the clamp has an undercut slot or groove i0 crossing the same and adapted for the reception of the cutter, the wings of the slot engaging or being located adjacent either side of the cutter, as shown in Fig. 3. Upon rotating the nut *0" to draw the bolt 4:0 inward the cutter 23 is clamped between the overhanging wings or walls of the undercut slot 40" and the wall of the groove 34, thereby clamping the cutter firmly in position. The clamping-bolt LO being non-rotatable in the holder, the undercut slot *0 in the said-holder remains in proper position to receive a cutter 23 even after the removal of the latter from the holder. To prevent the cutter 23 from being bowed or sprung when the clamp is tightened, the bolthead 4:0 has lips Fig. 6, which form continuations of the overhanging walls of the undercut slot and overlap the holder on opposite sides of the said recess orchannel, thus limiting the inward travel of the bolt and providing clam ping-surfaces on the bolt-head directly opposed to the bottom wall of the groove 3 1.

The point of manipulation of the clamping means for the stationary cutter being somewhat remote from the cutter itself is readily reached and being removed from other adjustments of the trimming mechanism is operated without confusion with them.

Having thus described my invention, I claim 1. In a trimming mechanism for sewingmachines, a cutter-holder provided with a channel extending entirely across one of its faces, an adjustable cutter-clamp having a head extending transversely of said channel, the clamp having a slot across its head and a groove on either side of said slot forming a channel alining with the channel in the holder and two wings for holding and clamping a cutter loosely fitted between the wings and means for adjusting the said clamp to draw the cutter against the face of the holder whereby the cutter is clamped between the said wings and the said face of the holder adjacent to the channel across the said holder; substantially as shown and described.

2. In a trimming mechanism for sewingmachines, a cutter, a cutter-holder provided with a cutter-clamp channel in one of its faces, an adjustable cutter-clamp having a head fitted in said channel and clamping portions overlying the clamping-surface of the holder on opposite sides of the channel, between which clamping portions and the holder the cutter may be clamped and means for adjusting the clamp, substantially as shown and described.

3. In a trimming mechanism for sewingmachines, a cutter holder provided with a channel in one of its faces, a cutter-clamp having a head adjustably fitted in said channel, the clamp having an undercut groove across its head forming two wings for holding and clamping a cutter loosely titted between the wings, the said wings having extensions or lips overlying the clamping-surface of the holder to limit the adjustment of the clamp and provide clamping portions between which and the holder the cutter may be secured and means for adjusting the clamp to draw the cutter against the face of the holder whereby the cutter is clamped between the said lips and the said face of the holder adjacent to and on opposite sides of the said channel across the holder, combined and operating; substantially as shown and described.

4:. In a trimming mechanism for sewingmachines, a cutter-holder having two intersecting channels extending entirely across its face at an angle to each other and one being of greater depth than the other, a cutter located in the shallower one of said channels. 

